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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71a4508f5f48dafaf8776a0787eb7bdd61117cd2a1049b6b5f953aef81b7887' 
  AND token = 'cb3slR75sFCOMwVmPZcjhxHzNi0OQ752yML/fYGDb24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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