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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa96a9420e8b5b1df5d516fb1f93fff6bba5322f2dfe070f607abd9e4c2f5ad' 
  AND token = 'gfmOD9DRRyFawiMHbnddP623mHzbI/93J1Tp6lAGEHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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