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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6fdc5e9cdbd18f620d589305d3067eccad313428a99b4270ab30c3c329463b' 
  AND token = 'YL3ErEvAP4sKv4q7Jx6t7mePYevHya2cgdVTluRb5rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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