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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0140f93896cd1262926b7acac10c5c17414d6aef4933185dcf4b8c87063577d6' 
  AND token = 'yoc7K6kAE5vrNo/MLMIm6slfMWBXwvxk3cSKkMpVOJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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