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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83a8f01bb3ecce6dc3b97ed54c6993a6630e54dc7f778a56b889f24b31f255d' 
  AND token = 'iXO4g8kE+nLQj+ismdfLB3MVlwVhho3LMpkvY0my8t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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