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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb46549c98b713eeb7906f738aa4c7b2021c72fef56df8c8eec292506e44c1e' 
  AND token = '5knr7rDpRTyHlsrHP5gh5MhRW/qnaTPDXqmPlwj6Geg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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