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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41076cf084c06b94be3620c43f8d3ad29b0b462c224af14b14af323cfd26000' 
  AND token = 'fKWoRUUqCLtNe35IRDITri6qARhpMbq/95Q0kzjcmJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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