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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc8f06cbcd04f1dfa912d1b3561c77a62d84771be63da099440ef14ef8eb067' 
  AND token = '7jBLhjO/yv3w5QsjpH0Kc5s4yaRH5Dk+aOVTgAWn9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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