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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd19d4a59f5a10273c8c493aeeda0ec8fe8b38442a9a1dc75b01887552404cfb' 
  AND token = 'GdV/lck2sYK9SeOh5b4GWtmQSk87ZfT9yTLmaEr5heI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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