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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8999f6d08648b4b0344707fe651e3fba9d070aaaea8ed15a44b21c1d1ec4ff4e' 
  AND token = 'fVIxj2okoY/RJbkRD4sqKIWzqkH4TUPOIh/Nl/LWP6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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