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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629082d1b37f0e1cd1967338d5faad7ca30c65c5bf19be3881b456ec196469cf' 
  AND token = '/p8LyW5FMfU+Bw0PT047Y5XXMSkQmxivbN5WdGzNr0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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