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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7b7c0abb287cfd13a3b27bc05346d746cfcb644143e1752e37de683b681fdd' 
  AND token = 'skhKYngxM2iQ2z2GHoqGo4qv0vTCXPvsNx+680Uog+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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