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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd42034d3903a972f16b567133c0b9af4d7797f0c9a62f1d4b58c2dc995a633c' 
  AND token = 'Y2Jj3uKyM/e/2xWpk3Jqwry6ADBrq9ChinfDvxUyMwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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