SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f55327e2285a3a29be088f28483fe6fdcbaa777829c5ad747f1bffaf562904e' 
  AND token = 'CVpaqdGivq/JRwO8z+jl4Bux6ai7gN2UwfQA6mU+wm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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