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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa871e2529d665f0e3709884640dd5443673600ba17fb6ae4c856d083e50832' 
  AND token = '0vY3GNEpBi3fcjR+A8WIlLntUoZHwic3pKFVhMw4m6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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