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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2c01cd17fdb0c9730b7c84c442ea9a1eed5cb2ad3159a0ee51de9a783df24b' 
  AND token = 'nZ4TQRqWJtLI3oR0Si/VcScgHo/MCWF1cEbS0wqBGPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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