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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e7dd5148e01987d3931a5adee2fec141df832a376bc68880bbf5f42851b2e6' 
  AND token = 'zv+1dUrTpLQN56fJaZZ1sgmMgWUOo3D/JptUr/1/ezE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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