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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd079b7ec6875e1e4052ed35a7383a0e1817f4164d99199dc73203b2c5b9ccbf3' 
  AND token = '12Wilecn333w/cawTg6rEiOGJu0yl0Ytcun7cE5EnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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