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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbec5547fcea430fc625edfe6710f5eaff89b03d6ae692ed80918b0d4188dc4' 
  AND token = '/PxDNVWEkADapvQzbZZtulZKX0wVdOXqIMMKSZ3Xt54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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