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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048da3d876ce3894944ec54b2a6b3bd109ea156fafd1d98d32e9fbd7a22f4e8c' 
  AND token = 'xEuZzvchxavrgCFNC8A1V4MLm7opd/+VvAhM+9CcBcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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