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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf3fdb172ad6529207c928c304c758cb4b973a5af970c66668aa877842f2a1a' 
  AND token = 'SG7j0sW+laVeACt8r8szv4PLhqaYH86Y7/51hi56Ibc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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