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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3268491e3bed2a6e961fb5f48ad016b98d8ecf7405e5876da3a2d35bd5134b' 
  AND token = '9C67C/Aedxw/7nCHj74TeT2tdlEu5Th3sT8jD2d13t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00755

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}