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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e1e69c3522cab94cfc23ca7cc89e6e0f2f2708771802c40fe627da0b94fb30' 
  AND token = 'tSi95v7jZ8Bam1QsjJokUmjjHrmcKHi022YUSTCdrxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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