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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fa96258cc677687850130cef9a434765ec0b4275a5eaf70f3a2d38f66b5b3e' 
  AND token = 'NS3YCTsg9vo3WN2sfftBpFXONrQ15yA/Tl40U1R1fbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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