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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148bb3c3baa7e2699da4f1cc54577f0d9128e5686f770293ca92e5890177795b' 
  AND token = 'AMxG3n3Kb4YB5aRu6M3nnX08UmjAc8/jlIddxae3UkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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