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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b527552a71e123043ed1d79642cf533583119d43a8df3702399a041e98d85571' 
  AND token = 'SJoETyDAt9nWfo2gt59r76M3Gqu039yNh0cCHl3tlmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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