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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a66d79c86d1807861ff23bd89fe3b4856e07dde0d8bd018680bdb7e9b4d582' 
  AND token = 'ovzmIABRyT9oFhAmiJ20Oe57nE9JYh9A2/k8871VMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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