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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18859de5d56f6235b778cac08e47c21ef6397caec1cb52b1ca2e646e496541f1' 
  AND token = 'qXLLJTixhoWAfGivWzZEPpe6AX2Chyc6XAh4aDI2J9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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