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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3076cc58463dfa6f51468aa0d47927acba6a96e2f105327f1439b827d25ec10' 
  AND token = 'RYKrhmrU3eAlBiMKPVDa2cScfEvV0vXDCjH5+6knRBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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