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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9eb9b77d3e97e2ac8ddf12da74dbf407d303d14ea597cb220c78257e880df' 
  AND token = 'ohISuIzPXNi/RpfRA0FJMK8tsx3fali8EyKR11AUG8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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