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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c40c2c060dcbc518167932f061d58c38c0f748081405fa599d97a909beb975a' 
  AND token = '9VEoQ5pFcEhO4BOf4ZXfLX9dcD4PVIgBbg04KZnsjZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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