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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055109696b447b9908379707e231d00c66b71be6b3f68a546cd2e01130160c23' 
  AND token = '8qReH3zPhoIQVH0rPqWQdzdL4gOfcfWgzF7d6yFE1lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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