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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bf283ea53072d502a5d88bcbd5c0ef4cae906882b17b82f5cca8bf573c654e' 
  AND token = 'UEzlviYx/AmBUSSetP0pNhyI8S0gEznEVE3kDMvl8Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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