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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a03be2ce593575f17c7bd8893f58f4cf5e09f366c4e03914fa8a9e9d747aae9' 
  AND token = 'vqQ+NyHj9JivOe638lc09yYLDskrtNS4xmVQLkQaGcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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