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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae82da5c1f9f0fb4a252f521808c106a7aa33e15530820048f29ecb44e280d27' 
  AND token = 'x+RsEkm9zSkARk4paLvMhsCGTB8IG9BRZJKa5kXIQ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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