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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31432bdb1ed7191f1edcb731fccc049fd64b7efd1edce12d61b0e14da3a5e8f' 
  AND token = 'kZo3mGOkLH8zbOmP4pg2ca0kLQH1I+5hunJKW9f/p5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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