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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5376adbc3b24257724c4d998bd24def6c7fed9e2fbf25328ee2f0389c74c8723' 
  AND token = 'fFmacazk/cmyv2zjcfqb1q9k+Wl0yCDKp0ctJpizzFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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