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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777dc3b34910c5496bc202c8227836f5c71e8df29ccc7cad3c6cfe3622578770' 
  AND token = 'zSiq36MAqYRjWGqeR48BVu1Dy13N1NPRNuL2ukS1q38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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