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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcf2ce1faf69dde35880c48060fc81be04b6e9f3b608813f7cdbc235462ae1f' 
  AND token = 'Q5f3FiCr4QfWqDBFCG0X250LSiaRGH3Nj9Po1prmbFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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