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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4763e6e0462c00a2cfc53af95cfb078027f994208424847010b7ab2b1b07e948' 
  AND token = 'A/B5KiN0uVTHQgQ7tF8a9uShT8Zm7V5SVIAnHvbePoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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