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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c317130c7abc2f1125ea2582a150e47c4b0457895b42cf002357152dac2e059' 
  AND token = 'tVbqaFfoI4wZsN+dYrfb5AAKkVa+OU/Qu5DAu0MtFHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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