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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f719ba7fb794f3ac59a93990b03d85f3e37fbdf1e57cc3b7e7b04d37d4f8eeff' 
  AND token = 'FeArFcFKGxTvMF2n6UWGSk6fBBHWAfoYly96BXPvSYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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