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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c76d90007341b46e1eaf588a3c21de60b383f5dcf9fd9d6f931d5347ff398c' 
  AND token = 'fLTdC0zavBiEqfKO57D363j63nObMZQPCu/w7Bu8VYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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