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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a402467464c95043c5dd309e2c6caf09895ca214d9d77b004d19c488e12df93a' 
  AND token = 'r/MqtZGyPGRQnPiTxM9899xed8lcJXGOtZmkVTo9BWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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