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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0ba2db4f05714cd98545ccfe6135a0fe72eba95c5d29222e3cbc406ecdd10f' 
  AND token = 'O20pMgifeg0o1HjEpKTGCgN4lh9jewDm2WyB3XTmqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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