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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8a78a29356f80bbcd81423c04b123683ae5942f633aae36d006abd774533ab' 
  AND token = 'H3rEubKmojYdpvKKRyNOru6J/bViN2mJ+/H07dp/P8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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