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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65bf623f3f37b1205e4b4937c6af53860b820c99fa78a6137e6a8e4bc9e709d' 
  AND token = 'aHZwR3jyruNTJ363fo5gu5OqV19zqsK7NPCU82idam8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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