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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6f70b70101ffbb6874143ae4363beafea493417c03bcbbe4580e54074f4837' 
  AND token = 'rL5G1cEzca7QkTgLmU9RF4CKp+JEObtZcurbF7+IqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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