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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3161468e557bc6523f064316c3218255b008c496fdb9a18efae519949a06ce66' 
  AND token = 'Zh6TXTPK1nc8bhtvb+ZS5LW8CxVrkA5ZKOmNxFQC3yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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