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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b093848303298025604034ddbffe3fbfe33eb91991cb951928f5acfd94172da2' 
  AND token = 'LcBPaHt8aUm+jn1AnFc2FgdKXtBGu5gB0eV2gk8ykQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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