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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe43c8ec435c779893871833beef2bfc4c755ce92ecc5fa16d5233265faf7731' 
  AND token = 'WqPvsPgSxLwlEdFjaX7UmLEyvwCrT1/D2A4kZSwuD2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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