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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e55bb3f8e213dd98ff0380ea29f09773784773997e9b3a9dc3eb8993df5f5d4' 
  AND token = 'mwEDZeTqKS500LGqYQ7wF4kb333dz5QuyhJN260AHjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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