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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a969790be4a9ff17551c9ac70ec3f1f2f381cae22d09e5240b2fc97d8cc345ec' 
  AND token = 'xxVICyMHSXnAM2ZNwiydvIyTfQfjGUNgRp+Wxx7meo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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