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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9f620522fb8e74c1ff1b596356a325d78284785ee587bffa87dfb524417d15' 
  AND token = 'RkIri8ZSFz5iq932loj7OAfd9ezo4GjhKM5/ozfYvuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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