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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32edd43305ef0ee563ef82d99d7a901b946d540699328992e24f3a60d6c01031' 
  AND token = 'KxPav5b788rMD5c8za1NY76VX6VxuELH9pU04mVT4Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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