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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1802ecc4ce565ab8a66a6ab3cbe885483a2557651a51ef82abe648a63f7b39fd' 
  AND token = 'FzxZcGaqvySPzG+NVALABva9Vv7+KOXJ4B1M78550FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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