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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4a697eda1241b3b61cb0e3c95bd020b5790f27469c0e6ff51883626e30b862' 
  AND token = '35j3ot777NkhtLFhBoKC83K8+gfwiQfR++3Yu2E8q3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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