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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf63e57e1c9be0123ceb9f864c452fbe47d009f2364e1e65b93999a79c57342' 
  AND token = 'WKTkDP6yKiBB/JRcgTuxd1nVqJH/spJjd4syTSXu1TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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