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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a6a1fc14b5b4fbe7d8d6325231940fab33b683176bd9bf9a3aa933af1db810' 
  AND token = 'CCiuLLTzmGYkHSynZ1cSNOHoA3MDVu9B6l5W6fQkdPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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