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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40ec072181fc3d0019b51626f568172c7952a66c07051353429cfdfd3d8d48b' 
  AND token = '9Js9AzD2uQANP+3L+3lsm75hwvLOo1xthuIb1xGIC5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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