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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05736dbc2308369a218457f47336e825a691f040660ceefc1daada1c2f0d7d8b' 
  AND token = 'Woj62j1EyoQ91uwajjqOnL+ue/NY5Vii/P43RgGs+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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